The purchase-mortgage market in the first half of 2013 has shown solid gains over the same per-iod last year, especially in a handful of booming state markets, but different lenders are having widely varying success getting on top of the wave. A new Inside Mortgage Finance analysis of Fannie Mae and Freddie Mac loan-level data shows that 20.2 percent of single-family mortgages securitized by the two government-sponsored enterprises in the first half of the year were purchase-mortgage loans, and total volume was up 31.1 percent from the same time last year. First-time homebuyers accounted...[Includes two data charts]